Induction-coil.



N0.882,048. PATENTED MAR. 17 1908;

M. s. BRIGHAM. INDUCTION 0011,.

APPLICATION FILED AUG. 19, 1907.

WITNEJJEJ 14 WEWTOR /V/mm M,

UNITED. STATES, :PATENT "orFIoE.

MELVILLE' s. BRIGHAM, or nn'rnornfiiiomein, AssicN'on or ONE-HALF 'r'o-A; R .:BLISS,

I or" LoWELnMAssAcHUsETrs, I

rnnucTIoN-oom. j

Specification of Letters riaten t. Patented March 190B.

' Application filed August 19, 1907. Serial No. 389,295.

, To all whom it mag concern: 1

Be it known that I, MELV-ILLE S. BRIGHAM,

a citizen of the United States of America,

residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Induction- Coils, of which the following is'a specification, reference being had therein to. the accom panying drawings.

The invention relates generally to induction coils for igniting and'exploding-the cylinder charges ofexplosive engines, and the invention consists in means associated mechanism of this character for preventing premature sparking and the consequent reversing or stopping oi the engine.

In .the manufacture of induction coils it is highly desirable for obvious reasons to economize space, and with this end in view the coils,where a number are to be employed,are grouped in .close proximity one to another, usually'in a single box or casing of minimum size. ment of the coils, the respective seconda windings are closely adjacent, with the result that in many instances where one secondary is energized a current is induced in the next adjoining secondary by reason of 'the close proximity of the coils. This induced current causes the premature sparking, and

it is to obviate this defect that the present invention is designed.

In the drawings illustrating my invention Figurel is apers ective view of the conventional fo'rnt of t e sparking coils, showing the means for preventing the premature sparking; Fig. 2 1s a sectional view, showing a modified form of induction coil mechanism and also showing a modification of the invention; and Fig. 3 1s ,a diagrammatic vlew,

illustratin the circuits for the coils.

In the rawings thus'briefly described, A designates an induction coil of'the usual construction, arran ed, as customary in a' box and thesevera coils,-four in number,

'as illustrated in Fig. 1, adapted for use connections are made betweenthe contacts In-Fig. 3 'the' primary and the coil windings.

windings of two adjoining induction coils are In view of this arrangeand secondary shown diagrammatically. a and b designate the primary windings, c and d independent circuits for these windings, each including the battery e common to both circuits.

representsqa commutator adapted to rotated by any suitable mechanism, and actand open the primary circuits, thus inducing currents inthe secondaries. g and h repre- 'in-g upon its rotation-to successively .close sent the secondary windings respectively for the primaries a and I), included respectivel in circuits '8 and "provided. with the i usua sparkaps k and arranged within the cylinders.

urr'ents are induced in the secondary circuits, producing successively sparking at the aps the s ark acting to explode the cylinder dharge iii the ordinary manner. I

The means employed for preventing induction of currents in the secondary windings by the influence of the immediately adjacent coil are open magnetic circuit shields,preferably in the form of plates, asD (Fig. 1),formed of cop er'or other suitable conducting material. hese plates,. as shown, are arranged one intermediate each pair of adjoining coils. In Fi 1 the plates are shown as rectangular in orm, of

slightly greater width than the width of the box, and engaging grooves, as m, in the box or casing sides. j

' In Fig. 3 a modified form of plate orshield is shown, consisting of the body section E anism described arranged in operative relation bet ween the secondaries, I absolutely prevent premature sparking with its resulting disadvantages, an provide means cessively. in every instance.

similar to th'e'plate D descr bed,-provided I00 whereby the charges will be exploded suc It will be obvious fromthe construction of the shield mechanism that the particular,

forms illustrated are not essential,- a'ndthat various modifications may be constructed without in any manner departing from thespiritot my invention. I do not therefore its desire to be limited to the specific meuns shown, although I deem the same prelerzilile in use.

What 1 claim as my invention is 1. The combination with a plurality of o wen magnetic circuit coils arranged in close proximity one with another, ol an elec tric circuit for each coil including its primary winding, a plurality circuits corresponding in number to and including respectively the secondary windings of the coils, means for successively closing and opening the several circuits of the primary series, and means for preventing the induction of currents in each secondary winding by the influence of its immediately adjacent secondary.

2. The combination with a, plurality of of independent open open magnetic circuit coils grouped in proximity to one another, of :m eleelrie eircuit for each coil including its prinnn' winds, corresponding in number to and including respectively the secondary windings ol' the coils, a commutator for successively closing and opening the several primary circuits, and an openinngnetic circuitv shield urranged intermediate each pair of adjoining coils.

In testimony whereof l zillix my signature in presence of two witnesses.

\lE-lA ILLIC SJBRIGIIALBI.

Witnesses? A. EIJA WILIJMis, Ilium! W. (.iALVlN a plurality of indemndenl open eircuils 

